RS8234EBGC Mindspeed Technologies, RS8234EBGC Datasheet - Page 67

• Manufacturer Part Number: RS8234EBGC
• Description: RS8234EBGC ATM XBR SAR
• Manufacturer: Mindspeed Technologies

28234-DSH-001-B
ATM backbone. Under worst case conditions, Ethernet packets (64 octets) map
into two ATM cells. At OC-3 rates, the RS8234 converts 176.6 k packets/second
to cells in each direction. Therefore, the host must process control and status infor-
mation for a total of 353.2 k packets/second. This packet rate equates to a packet
service time of 2.83 microseconds/packet.
An Ethernet Switch uses a RS8234 based subsystem as an uplink to an OC-3
3.0 Host Interface
3.1 Overview
The RS8234 segments and reassembles user data packets at 200 Mbps simplex,
and over 155 Mbps full duplex. The actual segmentation and reassembly
processes execute without run-time host control. However, the ATM host system
supplies the data for transmission and buffers for received data. In addition to this
control, the host processes status returned from the SAR. To take advantage of the
RS8234’s high throughput, the host must process control and status information at
a comparable rate.
performance requirements on the host system. High throughput systems require
large numbers of processing cycles and efficient utilization of system buses.
With this interface, the RS8234 facilitates a scalable, distributed host system. The
interface also minimizes the impact of an ATM port on the host system’s PCI bus.
In cases such as the example above, the service rate places extraordinary
The RS8234 provides a flexible, high performance host interface architecture.
APPLICATION EXAMPLE
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